Component Testing: Canister
On all models, check for clogged filter and/or stuck check valve by blowing low pressure compressed air into canister tank port. Check that air flows freely out of other canister ports.
On Pickup, blow air into the purge port and check that air flows freely through other ports.
Replace canister if it does not operate as outlined.
CAUTION:
Do not inhale fuel vapors when blowing into valve. Fuel vapors can be a health hazard.